Vibration at 70 mph, Driveshaft in question

[Arsenal741]

Yeah the carrier bearing has some movement which initially led me to want to replace. Looking at the cost and complexity to replace, I figured I'd just swap out the whole driveshaft since the carrier bearing is half the price alone. I dialed in a bit of positive toe and that seems to help but did not remove the underlying vibration.

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[bostonburner]

Yeah the carrier bearing has some movement which initially led me to want to replace. Looking at the cost and complexity to replace, I figured I'd just swap out the whole driveshaft since the carrier bearing is half the price alone. I dialed in a bit of positive toe and that seems to help but did not remove the underlying vibration.

Yeah, I was looking at replacement too but considering mine failed around 50k and the bearing plus labor is going to equal the cost of the tom woods driveshaft I figured if the drive shaft makes it 50k it will be worth it. The driveshaft is an easy diy swap and customer support for tom woods is excellent if you have any questions.

 

[Arsenal741]

Had the wheels balanced/rotated and swapped in a new OEM driveshaft yesterday. The old carrier bearing was roached but the u-joints felt good still. I had a chance to get a few hrs on the interstate at 70 mph and there is a noticeable improvement however it does still feel as though a baseline vibration is present around 70 mph. I may look at drivelines angles/rear springs next. I have been wanting to get a slightly higher rate rear leaf set for some time as I load the bed up for frequent camping in the summers.

Thanks to all for their insight.

 

[TJC]

Had the wheels balanced/rotated and swapped in a new OEM driveshaft yesterday. The old carrier bearing was roached but the u-joints felt good still. I had a chance to get a few hrs on the interstate at 70 mph and there is a noticeable improvement however it does still feel as though a baseline vibration is present around 70 mph. I may look at drivelines angles/rear springs next. I have been wanting to get a slightly higher rate rear leaf set for some time as I load the bed up for frequent camping in the summers.

Thanks to all for their insight.

Sad to say, but I think its the driveshaft. Mine did this from new. Low speed shudder, and over 75 severe life threatening shudder. 70 mild shudder.

Reality sucks sometimes. Maybe you'll get lucky and find it's the angles - they will certainly cause the issue if they are off (and they will be off). But Ford's design is not optimized for smooth delivery of power, it designed to be cheap and just good enough to last through the warranty.

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